Check if a file exists in $PATH in Rust

bin_exists.rs

// look_path returns a boolean indicating if the binary can be found in $PATH.
fn look_path(path: &str) -> Result<bool, std::env::VarError> {
    std::env::var("PATH").and_then(|paths| {
        Ok(paths
            .split(":")
            .map(|p| format!("{}/{}", p, path))
            .any(|p| Path::new(&p).exists()))
    })
}


fn main() {
  match look_path("echo") {
    Ok(found) => {
      if found {
        // found
      } else {
        // not found
      }
    }
    
    Err(err) => {
      // handle error
    }
  }
}